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uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged. |
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#1
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I have a Davis VP2 and I also have a stream running through the middle of my
garden. Does anyone here have any experience with water level sensors? Can any of them be tied into the Davis console? I'm not too bothered about that really so long as I can get the data out of the sensor (wirelessly) in real time I can log it to same database as my weather data. It would be really nice to plot some graphs of rainfall against water level and possibly programmatically predict when flooding is likely. -- Brian Wakem Lower Bourne, Farnham, Surrey http://www.brianwakem.co.uk/weather |
#2
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Freddie wrote:
Brian Wakem Wrote in message: I have a Davis VP2 and I also have a stream running through the middle of my garden. It would be really nice to plot some graphs of rainfall against water level and possibly programmatically predict when flooding is likely. I think that you would be hard pressed to find any meaningful correlation. The stream flows through your garden - so it has come from somewhere else. You may get a better correlation with rainfall data from the area of the source and course of the stream. The upstream catchment area is quite small and near, the source being about 1 mile away. It is spring fed so I would need to factor in rainfall over some sort of moving average period and add on today's rain to get an estimate of flow but I think it should be doable. -- Brian Wakem Lower Bourne, Farnham, Surrey http://www.brianwakem.co.uk/weather |
#3
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Well there's three parts to this question (other than interpretation, which
Freddie has started to address). Can you: 1. find a suitable water level sensor? 2. interface it to a VP2? 3. configure the logger/software to log the data? As to [1] then I imagine the answer must be yes, though offhand I don't know of any parts that are directly compatible. Don't expect the sensor necessarily to be cheap though. If you can arrange for the output of the sensor to be on a 0-3V scale (most likely via some simple intermediate circuit that converts the native output of the sensor to 0-3V) then yes it can be interfaced to certain inputs on a VP2 - the UV sensor is the one most likely to be free. but there are other options. For [3], well, on a standard VP2 console/logger setup, the logged value would be on the scale used by whichever sensor input you were using, eg for UV it would be on a 0-16 UVI scale (IIRC). If however you were to use an Envoy8X console to receive from your VP2 transmitter and log to the 8X's WDTU software then that gives you full control over the scaling etc of the new sensor reading and you could set the unit up to read in eg cm (or whichever other units you preferred). In summary, it's all perfectly feasible in principle but it would require some development. And the final readings would make much more immediate sense if an Envoy8X console were used. |
#4
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Brian Wakem Wrote in message:
I have a Davis VP2 and I also have a stream running through the middle of my garden. It would be really nice to plot some graphs of rainfall against water level and possibly programmatically predict when flooding is likely. I think that you would be hard pressed to find any meaningful correlation. The stream flows through your garden - so it has come from somewhere else. You may get a better correlation with rainfall data from the area of the source and course of the stream. -- Freddie Pontesbury Shropshire 102m AMSL http://www.hosiene.co.uk/weather/ http://twitter.com/PontesburyWx for hourly reports ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ |
#5
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On Saturday, September 26, 2015 at 7:46:54 AM UTC+1, Freddie wrote:
Brian Wakem Wrote in message: I have a Davis VP2 and I also have a stream running through the middle of my garden. It would be really nice to plot some graphs of rainfall against water level and possibly programmatically predict when flooding is likely. I think that you would be hard pressed to find any meaningful correlation. The stream flows through your garden - so it has come from somewhere else. You may get a better correlation with rainfall data from the area of the source and course of the stream. -- Freddie Pontesbury Shropshire 102m AMSL http://www.hosiene.co.uk/weather/ http://twitter.com/PontesburyWx for hourly reports ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ There is an interesting correlation between the stream in my garden and river flooding at Newlyn. The source of both are the Penwith moors 4 or 5 miles away, then they run down parallel in NW-SE aligned valleys. Runoff is rapid. On 3 occasions (since 2007) the stream has just covered a sewage pipe which crosses it, and on each occasion there has been flooding at Newlyn. There have been no other cases of river flooding at Newlyn during the same period. The EA should attach a warning sensor to the the top of the pipe! Graham Penzance 6.3C min last night, coldest since the Spring. |
#6
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Brian Wakem Wrote in message:
Freddie wrote: Brian Wakem Wrote in message: I have a Davis VP2 and I also have a stream running through the middle of my garden. It would be really nice to plot some graphs of rainfall against water level and possibly programmatically predict when flooding is likely. I think that you would be hard pressed to find any meaningful correlation. The stream flows through your garden - so it has come from somewhere else. You may get a better correlation with rainfall data from the area of the source and course of the stream. The upstream catchment area is quite small and near, the source being about 1 mile away. It is spring fed so I would need to factor in rainfall over some sort of moving average period and add on today's rain to get an estimate of flow but I think it should be doable. Looking at your location, I guess you are near to chalk-based bedrock - so your catchment definition could be complex. I don't envy you trying to to do this... -- Freddie Pontesbury Shropshire 102m AMSL http://www.hosiene.co.uk/weather/ http://twitter.com/PontesburyWx for hourly reports ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ |
#7
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Brian Wakem Wrote in message:
Freddie wrote: Brian Wakem Wrote in message: I have a Davis VP2 and I also have a stream running through the middle of my garden. It would be really nice to plot some graphs of rainfall against water level and possibly programmatically predict when flooding is likely. I think that you would be hard pressed to find any meaningful correlation. The stream flows through your garden - so it has come from somewhere else. You may get a better correlation with rainfall data from the area of the source and course of the stream. The upstream catchment area is quite small and near, the source being about 1 mile away. It is spring fed so I would need to factor in rainfall over some sort of moving average period and add on today's rain to get an estimate of flow but I think it should be doable. Looking at your location, I guess you are near to chalk-based bedrock - so your catchment definition could be complex. I don't envy you trying to to do this... -- Freddie Pontesbury Shropshire 102m AMSL http://www.hosiene.co.uk/weather/ http://twitter.com/PontesburyWx for hourly reports ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ |
#8
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Freddie wrote:
Brian Wakem Wrote in message: Freddie wrote: Brian Wakem Wrote in message: I have a Davis VP2 and I also have a stream running through the middle of my garden. It would be really nice to plot some graphs of rainfall against water level and possibly programmatically predict when flooding is likely. I think that you would be hard pressed to find any meaningful correlation. The stream flows through your garden - so it has come from somewhere else. You may get a better correlation with rainfall data from the area of the source and course of the stream. The upstream catchment area is quite small and near, the source being about 1 mile away. It is spring fed so I would need to factor in rainfall over some sort of moving average period and add on today's rain to get an estimate of flow but I think it should be doable. Looking at your location, I guess you are near to chalk-based bedrock - so your catchment definition could be complex. I don't envy you trying to to do this... 'Gault Clay' according to this http://www.bourneconservation.org.uk/geology.htm -- Brian Wakem Lower Bourne, Farnham, Surrey http://www.brianwakem.co.uk/weather |
#9
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JohnD wrote:
Well there's three parts to this question (other than interpretation, which Freddie has started to address). Can you: 1. find a suitable water level sensor? 2. interface it to a VP2? 3. configure the logger/software to log the data? As to [1] then I imagine the answer must be yes, though offhand I don't know of any parts that are directly compatible. Don't expect the sensor necessarily to be cheap though. If you can arrange for the output of the sensor to be on a 0-3V scale (most likely via some simple intermediate circuit that converts the native output of the sensor to 0-3V) then yes it can be interfaced to certain inputs on a VP2 - the UV sensor is the one most likely to be free. but there are other options. For [3], well, on a standard VP2 console/logger setup, the logged value would be on the scale used by whichever sensor input you were using, eg for UV it would be on a 0-16 UVI scale (IIRC). If however you were to use an Envoy8X console to receive from your VP2 transmitter and log to the 8X's WDTU software then that gives you full control over the scaling etc of the new sensor reading and you could set the unit up to read in eg cm (or whichever other units you preferred). In summary, it's all perfectly feasible in principle but it would require some development. And the final readings would make much more immediate sense if an Envoy8X console were used. The UV sensor is using the UV input :-) Perhaps I could use the wind input since that is not in use? The anemometer uses a separate wireless sender as it's on a pole on the roof. It doesn't really matter to me what units or scale it produces since I have my own script running between the log files 'WeatherDisplay' produces and my database so I can fudge it as necessary. Finding a suitable sensor is going to be the hard part I think. -- Brian Wakem Lower Bourne, Farnham, Surrey http://www.brianwakem.co.uk/weather |
#10
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"Brian Wakem" wrote in message ...
The UV sensor is using the UV input :-) Perhaps I could use the wind input since that is not in use? The anemometer uses a separate wireless sender as it's on a pole on the roof. It doesn't really matter to me what units or scale it produces since I have my own script running between the log files 'WeatherDisplay' produces and my database so I can fudge it as necessary. Finding a suitable sensor is going to be the hard part I think. ================================================ OK so both UV and (presumably) solar too are already in use? There's no other input on a standard SIM that you can use. (Wind is not a standard 0-3V input) Options a 1. Buy a 6345 multi-sensor transmitter and use one of the soil moisture inputs on that; 2. (Assuming your anemometer transmitter is relatively inaccessible ![]() another standard transmitter - 6372 Temp-only would be the cheapest option and receive data on either an Envoy8X console or a MeteoStick receiver. I don't think that finding a level sensor will be hard - there's plenty of different types around. One apparently cost-effective type (never seen one, but from a quick Google search) that I might be tempted to look at further is: http://milonetech.com/products/standard-etape-assembly Where you will need to do some development is adapting this to give a 0-3V output. May not be very difficult for a simple resistive output like this sensor appears to have, but will still need an element of electronics input. John Dann www.weatherstations.co.uk |
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